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<br />~iversion 4... divert water froa ~re"s into <br />aitcbes, canals or otber distribution aystems. <br /> <br />Detention 4.aB retard flood flow by retaining <br />water during periods of higb discharge. <br /> <br />Reaulation damB provide low flow au~entation. <br /> <br />Control damB are intended to reduce erosion and <br />Mdimentation. <br /> <br />B. Classification by Construction Katerials and Design. <br /> <br />c <br /> <br />( <br /> <br />domestic and industrial consu.ption, irrigation, <br />recreation, bydroelectric power generation and <br />groundwater recharge. <br /> <br />. <br /> <br />2. <br /> <br />3. <br /> <br />4. <br /> <br />5. <br /> <br />1. Barthfill damB are ..de of compacted or uncom- <br />pacted soil and ..y be hoaogenous or zoned <br />(i.e., ..y contain a zone or membrane composed <br />of material of low peraeability). <br /> <br />2. Rockfill damB use rocks of various sizes to <br />provide stability and an impervious aone or <br />membrane to tapede Mepage. <br /> <br />3. Concrete and ..sonrv daaB are sited on rela- <br />tively sound bedrock substrate and..y have a <br />gravity, arch or buttress design. <br /> <br />4. Timber dams are inexpensive to construct but <br />bave a short design life. <br /> <br />. <br /> <br />5. <br /> <br />are composed of material <br />tbe site by suspension in <br />technique is rarely used <br /> <br />Hvdraulic fill dams <br />that was conveyed to <br />flowing water. ~bis <br />today. <br /> <br />C. Classification by Hydraulic Design <br /> <br />D. Classification by OWnership <br /> <br />1. Public (Federal, State, County or municipality) <br /> <br />2. Quasi-Public (Water districts, irrigation dis- <br />tricts, public utilities) <br /> <br />T <br /> <br />( <br /> <br />1. OVerflow dams are designed to carry discbarge <br />over tbeir crest and tbus, must be constructed <br />of non-erodable material. <br /> <br />2. Ron-overflow dams are constructed witb spillways <br />and/or outlet works. <br /> <br />~ <br /> <br />. <br /> <br />-2- <br />